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Re : internal tree pits -- Daniel Wilkinson
Posted by M. D. Vaden , Mar 20,2007,20:01    Top of Thread   Forum

Typically, outdoors, gravel is not useful to aid drainage.

But in your case, if the bottom is concrete (hopefully there is a drainage hole) gravel may help.

In a pot-like situation, soil pressed on the bottom can dam or block drainage from getting to a drain hole.

If an inch or two of gravel is added, with a fine mesh to keep soil from pressing into it, then water can leach and drain freely from the whole bottom area of the soil and quickly flow to the drain hole.

M. D. Vaden of Oregon

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